Jersey JAXB Based JSON support - json

Question

I am trying to use Jersey's capabilities to produce JSON from my web-service methods.
Everything worked well but then I discovered that for a list of objects JSON representation contains something like enclosing root tag. I found out that I can configure JAXB Based JSON support with JSONConfiguration.natural() to produce a desirable result. So I wrote the following
#Provider
#Produces(MediaType.APPLICATION_JSON)
public class JAXBContextResolver implements ContextResolver<JAXBContext> {
private final JAXBContext context;
private final Set<Class> types;
private final Class[] cTypes = {TrRegion.class};
public JAXBContextResolver() throws Exception {
this.types = new HashSet(Arrays.asList(cTypes));
this.context = new JSONJAXBContext(JSONConfiguration.natural().build(), cTypes);
}
#Override
public JAXBContext getContext(Class<?> objectType) {
return (types.contains(objectType)) ? context : null;
}
}
And plugged it in like this
public class WebServiceApplication extends Application {
#Override
public Set<Class<?>> getClasses()
{
Set<Class<?>> resources = new HashSet<Class<?>>();
resources.add(OrderInfrastructureResource.class);
resources.add(OrderResource.class);
resources.add(JAXBContextResolver.class);
return resources;
}
}
<servlet>
<description>JAX-RS Tools Generated - Do not modify</description>
<servlet-name>JAX-RS Servlet</servlet-name>
<servlet-class>com.sun.jersey.spi.spring.container.servlet.SpringServlet</servlet-class>
<init-param>
<param-name>javax.ws.rs.Application</param-name>
<param-value>com.[...].WebServiceApplication</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
But for some reason I always get
java.lang.IllegalStateException: No JAXB provider found for the following JAXB context: class com.sun.xml.bind.v2.runtime.JAXBContextImpl
at com.sun.jersey.json.impl.JSONHelper.getJaxbProvider(JSONHelper.java:106) [jersey-json-1.17.jar:1.17]
at com.sun.jersey.json.impl.JSONHelper.getJaxbProvider(JSONHelper.java:106) [jersey-json-1.17.jar:1.17]
at com.sun.jersey.json.impl.DefaultJaxbXmlDocumentStructure.getXmlDocumentStructure(DefaultJaxbXmlDocumentStructure.java:76) [jersey-json-1.17.jar:1.17]
at com.sun.jersey.json.impl.writer.Stax2JacksonWriter.<init>(Stax2JacksonWriter.java:169) [jersey-json-1.17.jar:1.17]
at com.sun.jersey.json.impl.Stax2JsonFactory.createWriter(Stax2JsonFactory.java:105) [jersey-json-1.17.jar:1.17]
at com.sun.jersey.json.impl.provider.entity.JSONListElementProvider.writeList(JSONListElementProvider.java:133) [jersey-json-1.17.jar:1.17]
Can someone tell me why?
When I change the line
this.context = new JSONJAXBContext(JSONConfiguration.natural().build(), cTypes);
to
this.context = new JSONJAXBContext(JSONConfiguration.mapped().build(), cTypes);
it begins to work but gives enclosing root tag(well it is the same as not specifying any ContextResolver). Strange.(Strange meaning, that the difference is only in mapping type I provide).
I try to run my app on Jboss 7.1.1 with Restesy disabled(I have removed lines <extension module="org.jboss.as.jaxrs"/> and <subsystem xmlns="urn:jboss:domain:jaxrs:1.0"/> from my standalone.xml file). Also I use com.sun.jersey.spi.spring.container.servlet.SpringServlet as Jersey servlet.
Please, tell me what am I missing.
What could be the problem?

Answer 1

Apparently I was missing jaxb-impl library for my application so I just added jBoss' com.sun.xml.bind module in my jboss-deployment-structure file as following:
<dependencies>
<module name="com.sun.xml.bind" />
<module name="org.codehaus.jackson.jackson-core-asl" />
<module name="org.codehaus.jackson.jackson-jaxrs" />
<module name="org.codehaus.jackson.jackson-mapper-asl" />
<module name="org.codehaus.jackson.jackson-xc" />
</dependencies>